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<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 声明创建一个函数  params 是传进来的一个对象 对象里面有 &#123; params method sync &#125;</span></span><br><span class="line"><span class="keyword">const</span> axios = <span class="keyword">function</span> (<span class="params">params</span>) &#123;</span><br><span class="line">    <span class="comment">// 返回一个 promise 对象 </span></span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">Promise</span>(<span class="function">(<span class="params">resolve, reject</span>) =&gt;</span> &#123;</span><br><span class="line">        <span class="comment">// 创建一个ajax的实例</span></span><br><span class="line">        <span class="keyword">var</span> xhr = <span class="keyword">new</span> <span class="title class_">XMLHttpRequest</span>()</span><br><span class="line">        <span class="comment">// responseType 是一个枚举字符串值， 用于指定响应中包含的数据类型。</span></span><br><span class="line">        <span class="comment">// 它还允许作者更改响应类型。 如果将 responseType 的值设置为空字符串， 则会使用 text 作为默认值。</span></span><br><span class="line">        xhr.<span class="property">responseType</span> = <span class="string">&#x27;json&#x27;</span>;</span><br><span class="line">        <span class="comment">//设置请求行open()</span></span><br><span class="line">        xhr.<span class="title function_">open</span>(params.<span class="property">method</span> || <span class="string">&#x27;GET&#x27;</span>, params.<span class="property">url</span> || <span class="string">&#x27;http://localhost:8080/#/&#x27;</span>, params.<span class="property">sync</span> || <span class="literal">true</span>)</span><br><span class="line">        <span class="comment">//发送请求</span></span><br><span class="line">        xhr.<span class="title function_">send</span>(<span class="literal">null</span>)</span><br><span class="line">        <span class="comment">// 只要 readyState 属性发生变化，就会调用相应的处理函数 (en-US)。这个回调函数会被用户线程所调用。</span></span><br><span class="line">        <span class="comment">// XMLHttpRequest.onreadystatechange </span></span><br><span class="line">        <span class="comment">// 会在 XMLHttpRequest 的readyState 属性发生改变时触发 readystatechange(en - US) 事件的时候被调用。</span></span><br><span class="line">        xhr.<span class="property">onreadystatechange</span> = <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">            <span class="comment">// XMLHttpRequest.readyState 属性返回一个 XMLHttpRequest  代理当前所处的状态。</span></span><br><span class="line">            <span class="keyword">if</span> (xhr.<span class="property">readyState</span> == <span class="number">4</span>) &#123;</span><br><span class="line">                <span class="comment">/*</span></span><br><span class="line"><span class="comment">只读属性 XMLHttpRequest.status 返回了XMLHttpRequest 响应中的数字状态码。status </span></span><br><span class="line"><span class="comment">的值是一个无符号短整型。在请求完成前，status的值为0。值得注意的是，如果 XMLHttpRequest 出错，浏览器返回的</span></span><br><span class="line"><span class="comment"> status 也为0。status码是标准的HTTP status codes。举个例子，status 200 代表一个成功的请求。如果服务器响应中没有明确指定status码，</span></span><br><span class="line"><span class="comment">XMLHttpRequest.status 将会默认为200。</span></span><br><span class="line"><span class="comment">                */</span></span><br><span class="line">                <span class="keyword">if</span> (xhr.<span class="property">status</span> &gt;= <span class="number">200</span> &amp;&amp; xhr.<span class="property">status</span> &lt; <span class="number">300</span>) &#123;</span><br><span class="line">                    <span class="comment">// 响应信息</span></span><br><span class="line">                    <span class="title function_">resolve</span>(xhr.<span class="property">response</span>);</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    <span class="comment">// 否则返回状态码</span></span><br><span class="line">                    <span class="title function_">reject</span>(xhr.<span class="property">status</span>);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> axios</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<table>
<thead>
<tr>
<th>值</th>
<th>状态</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>0</td>
<td>UNSENT</td>
<td>代理被创建，但尚未调用 open() 方法。</td>
</tr>
<tr>
<td>1</td>
<td>OPENED</td>
<td>open() 方法已经被调用。</td>
</tr>
<tr>
<td>2</td>
<td>HEADERS_RECEIVED</td>
<td>send() 方法已经被调用，并且头部和状态已经可获得。</td>
</tr>
<tr>
<td>3</td>
<td>LOADING</td>
<td>下载中； responseText 属性已经包含部分数据。</td>
</tr>
<tr>
<td>4</td>
<td>DONE</td>
<td>下载操作已完成。</td>
</tr>
</tbody></table>
<hr>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">Author: </span><span class="post-copyright-info"><a href="https://szhihao.gitee.io">孙志豪</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">Link: </span><span class="post-copyright-info"><a href="https://szhihao.gitee.io/2022/02/21/07-%E6%A0%B8%E5%BF%83js%EF%BC%88%E6%89%8B%E5%86%99%E7%AF%87%EF%BC%89/promise%E5%B0%81%E8%A3%85axios/">https://szhihao.gitee.io/2022/02/21/07-%E6%A0%B8%E5%BF%83js%EF%BC%88%E6%89%8B%E5%86%99%E7%AF%87%EF%BC%89/promise%E5%B0%81%E8%A3%85axios/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">Copyright Notice: </span><span class="post-copyright-info">All articles in this blog are licensed under <a target="_blank" rel="noopener" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">CC BY-NC-SA 4.0</a> unless stating additionally.</span></div></div><div class="tag_share"><div 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